a.css

.valami_class {
  font-size: 12px;
  width: 100px;
  height: 100px;
  background-image: url("../images/blog/type_text.png"); }

.valami_mas_class {
  color: #aa0000;
  width: 150px;
  height: auto; }

a.sass

=valami($width: 100px, $height: 100px)
  width: $width
  height: $height
=img_bg($img_name)
  background:
    image:  url("../images/blog/type_"+$img_name+".png")

.valami_class
  font-size: 12px
  +valami
  +img_bg('text')

.valami_mas_class
  color: #aa0000
  +valami(150px, auto)